Plan the next move before hatching
Prepare and cycle the grow-out system while the adults are being conditioned.
Use footprint and behaviour
Active livebearers need swimming length; cichlid juveniles may need territory; labyrinth fish may need access to warm surface air.
Expand filtration gradually
Move seasoned sponges with the fish or add mature filtration before the transfer. Do not rely on a new filter alone.
Distribute food
Use multiple feeding areas so smaller fry can eat without constant competition.
Reduce density responsibly
Rehome, separate sexes and retain only the number you can maintain. Do not release surplus fish.